Lettertrace measures how often Claude, ChatGPT, and Gemini mention your company. But there's a catch: it's free, developer-first, bring-your-own-key, and open source.
Mathew here. I'm the founder of The Letter Company.
Today, we're debuting one of my favorite things that we've ever built. You've likely heard of AEO. Or GEO. Or AI Search. It's a popular space rife with tools. But there's been a big problem: it's pay-to-play. Even to find out how you're doing on AI Search, you need to fork over something crazy like $250/mo.
And I beg.... for what? AI search is effectively measured by a crafty cron job that orchestrates a bunch of model provider calls.
No more $250/mo fees. Now, it's free. Lettertrace is a BYOK telemetry tool for measuring how you're doing on AI search. It's open source. MIT license. Free even on our hosted version. There are no paid tiers. None. Nada. You'll never put down a credit card. We're moving beyond that. It's time we get telemetry on our GEO, just like we had on our SEO, without having to pay for it.
Lettertrace is super easy to use. Like SO easy. Why? Cause it's got an amazing CLI. Just install it, give Claude Code or Codex access, and your coding agent will go to town. It'll add the topics your buyers actually ask about ("best CRM for startups"). It'll generate realistic prompt variations and run them against Claude, ChatGPT, Gemini, and other major LLMs. It'll track visibility, share of voice, prominence, and sentiment.
npm install lettertrace. claude code. prompt. That's it. Or, if you're non-technical, sign-up traditionally.
And it's actually open source. Not open core, none of those gimmicks. A clean MIT license. Bring your own key. You pay the model providers directly, no markup on top. You'll spend ... maybe $3? If you're just paying to measure AI search, you're getting ripped off and we're putting an end to that.
Three things I'd genuinely like feedback on. First, which answer engines matter enough to add next. Second, whether the generated prompt variations read like questions real people ask, because that's the piece I'm least sure about. Third, did the video effectively explain our purpose as a company?
@pregasen Outstanding launch, excited to see Lettertrace quickly become the go-to standard for measuring brand visibility across LLMs, qq is there support for scheduled cron triggers built into the CLI, or is it intended to be hooked into existing GitHub Actions / CI pipelines?
@pregasen Congratulations on the launch! Free + open source is a real gift for founders.
One thing I'd love your take on: since it's BYOK, non-technical folks still have to go set up their own Anthropic/OpenAI/Google accounts before they can run it - that's a small ask for a developer, but a real wall for the small business owners you mentioned. Any plans for a managed-key path down the line? I can see this tool being very helpful for SBO.
I am so tired of share of voice tools charging money just for me to see if they work. I love that this is BYOK. I dont know why somwone didnt do this sooner. Kudos to the Letter Company. Appreciate that the video explains the business model too. Super smart
Report
Maker
@meet_patel24 Really appreciate you giving it a try! Glad the BYOK approach made sense to you. We wanted people to actually test it out and see the value before having to pay for another tool. Thanks for the kind words
This is cool! There are so many metrics out there used to measure growth or market penetration, this will be helpful in filling the AI marketing analytics gap
Report
Maker
@milescward Exactly! That’s the gap we’re trying to fill. AI visibility is becoming an important part of marketing, but the analytics around it are still pretty fragmented. Really glad
Ooh, love love love that this is dev-first and oss! Some insight on what you asked - "which answer engines matter enough to add next" - you've hit the main ones we track at Progress, but Grok could be good and for certain niches also Meta AI
Congrats, Matthew! This feels like one of those tools you don’t realize you needed until you see it. Curious to see how Lettertrace changes the way teams track AI visibility. 🚀
Report
Maker
@suryansh_tiwari2 That’s exactly what we’re hoping for. AI visibility is still pretty new, so we’re excited to see how teams end up using Lettertrace in their day-to-day workflows. Really appreciate the support!
Congrats! Tracking how you show up inside LLM chats is quickly becoming as important as ranking on Google was, and most people have zero visibility into that. Respect for making it open source.
Congrats on the Lettertrace launch, Mathew. The open-source + BYOK framing is very clean, and I loved that the website scan produces editable questions before the first run.
One launch-day thought from trying it: when a first run returns 0%, a new user needs one obvious next move. Is it prompts, competitors, model coverage, or simply a brand that is not yet visible? Turning that zero into a small diagnosis could make the first run feel much more actionable.
Replies
Lettertrace
Hey Product Hunt!
Mathew here. I'm the founder of The Letter Company.
Today, we're debuting one of my favorite things that we've ever built. You've likely heard of AEO. Or GEO. Or AI Search. It's a popular space rife with tools. But there's been a big problem: it's pay-to-play. Even to find out how you're doing on AI Search, you need to fork over something crazy like $250/mo.
And I beg.... for what? AI search is effectively measured by a crafty cron job that orchestrates a bunch of model provider calls.
No more $250/mo fees. Now, it's free. Lettertrace is a BYOK telemetry tool for measuring how you're doing on AI search. It's open source. MIT license. Free even on our hosted version. There are no paid tiers. None. Nada. You'll never put down a credit card. We're moving beyond that. It's time we get telemetry on our GEO, just like we had on our SEO, without having to pay for it.
Lettertrace is super easy to use. Like SO easy. Why? Cause it's got an amazing CLI. Just install it, give Claude Code or Codex access, and your coding agent will go to town. It'll add the topics your buyers actually ask about ("best CRM for startups"). It'll generate realistic prompt variations and run them against Claude, ChatGPT, Gemini, and other major LLMs. It'll track visibility, share of voice, prominence, and sentiment.
npm install lettertrace. claude code. prompt. That's it. Or, if you're non-technical, sign-up traditionally.
And it's actually open source. Not open core, none of those gimmicks. A clean MIT license. Bring your own key. You pay the model providers directly, no markup on top. You'll spend ... maybe $3? If you're just paying to measure AI search, you're getting ripped off and we're putting an end to that.
Three things I'd genuinely like feedback on. First, which answer engines matter enough to add next. Second, whether the generated prompt variations read like questions real people ask, because that's the piece I'm least sure about. Third, did the video effectively explain our purpose as a company?
Code: github.com/letterstory/lettertrace
@shabb_katoch Thanks a lot
Lettertrace
@shabb_katoch Thank you Shabnam!
@pregasen Outstanding launch, excited to see Lettertrace quickly become the go-to standard for measuring brand visibility across LLMs, qq is there support for scheduled cron triggers built into the CLI, or is it intended to be hooked into existing GitHub Actions / CI pipelines?
Lettertrace
@priya_kushwaha1 There is support! Doesn't need to be part of your CI Pipeline at all actually. It runs on any arbitrary clock.
@pregasen Congrats on the launch Mathew. Great vid....lead with top 5 hopefully. Good on you for open sourcing.
Lettertrace
@zolani_matebese thank you!
@pregasen Congratulations on the launch! Free + open source is a real gift for founders.
One thing I'd love your take on: since it's BYOK, non-technical folks still have to go set up their own Anthropic/OpenAI/Google accounts before they can run it - that's a small ask for a developer, but a real wall for the small business owners you mentioned. Any plans for a managed-key path down the line? I can see this tool being very helpful for SBO.
Inkle
How to Beat the Bots and Get Hired
I am so tired of share of voice tools charging money just for me to see if they work. I love that this is BYOK. I dont know why somwone didnt do this sooner. Kudos to the Letter Company. Appreciate that the video explains the business model too. Super smart
@meet_patel24 Really appreciate you giving it a try! Glad the BYOK approach made sense to you. We wanted people to actually test it out and see the value before having to pay for another tool. Thanks for the kind words
Lettertrace
@meet_patel24 Thank you for the kind words!
@milescward Exactly! That’s the gap we’re trying to fill. AI visibility is becoming an important part of marketing, but the analytics around it are still pretty fragmented. Really glad
Lettertrace
@milescward thank you!
Progress AI Observability
Ooh, love love love that this is dev-first and oss! Some insight on what you asked - "which answer engines matter enough to add next" - you've hit the main ones we track at Progress, but Grok could be good and for certain niches also Meta AI
Lettertrace
@denitsapenchevavaltchanova Awesome Grok and Meta AI is on next week's roadmap. We'll add!!
EverTutor AI
Congrats, Matthew! This feels like one of those tools you don’t realize you needed until you see it. Curious to see how Lettertrace changes the way teams track AI visibility. 🚀
@suryansh_tiwari2 That’s exactly what we’re hoping for. AI visibility is still pretty new, so we’re excited to see how teams end up using Lettertrace in their day-to-day workflows. Really appreciate the support!
Lettertrace
@suryansh_tiwari2 thank you for the kind words + for sharing it on Linkedin!
minimalist phone: reduce your screentime
What will be the monetisation model then?
Lettertrace
@busmark_w_nika Watch the video :) https://letter.company
minimalist phone: reduce your screentime
@pregasen I can see only this, where is the video? :D
ApyHub
I really like the idea of making AI search visibility more accessible, especially with the open-source and BYOK approach.
The fact that there are no paid tiers or extra markup is a refreshing change, and the CLI sounds great for developers who want to get started quickly.
Congrats on the launch! 🎉
Lettertrace
@gabriella_anjani thank you!!!
Looks good! Congratulations team
@hamza_afzal_butt Really appreciate the support 🙌
Lettertrace
@hamza_afzal_butt thank you!
Congrats! Tracking how you show up inside LLM chats is quickly becoming as important as ranking on Google was, and most people have zero visibility into that. Respect for making it open source.
Lettertrace
@mateuszkonik appreciate it :)
Bhava
Congrats on the Lettertrace launch, Mathew. The open-source + BYOK framing is very clean, and I loved that the website scan produces editable questions before the first run.
One launch-day thought from trying it: when a first run returns 0%, a new user needs one obvious next move. Is it prompts, competitors, model coverage, or simply a brand that is not yet visible? Turning that zero into a small diagnosis could make the first run feel much more actionable.
Lettertrace
@riya_jawandhiya the rest of our stack helps with that! https://letter.company